Add ASN info lookup and periodic routing table statistics

- Add handle and description columns to asns table
- Look up ASN info using asinfo package when creating new ASNs
- Remove noisy debug logging for individual route updates
- Add IPv4/IPv6 route counters and update rate tracking
- Log routing table statistics every 15 seconds with IPv4/IPv6 breakdown
- Track updates per second for both IPv4 and IPv6 routes separately

internal/database/models.go

@@ -8,10 +8,12 @@ import (
 
 // ASN represents an Autonomous System Number
 type ASN struct {
-	ID        uuid.UUID `json:"id"`
-	Number    int       `json:"number"`
-	FirstSeen time.Time `json:"first_seen"`
-	LastSeen  time.Time `json:"last_seen"`
+	ID          uuid.UUID `json:"id"`
+	Number      int       `json:"number"`
+	Handle      string    `json:"handle"`
+	Description string    `json:"description"`
+	FirstSeen   time.Time `json:"first_seen"`
+	LastSeen    time.Time `json:"last_seen"`
 }
 
 // Prefix represents an IP prefix (CIDR block)